Date calculations using “Today” in SharePoint lists for ...
https://natechamberlain.com/2017/06/17/date-calculations-using-today-in-sharepoint-lists-for-years-of-service-days-without-incident-etc/
Date calculations using “Today” in SharePoint lists for years of service, days without incident, etc. (includes using blank date values) This is a fairly simple solution that takes a date column, compares it to another date and gives you an answer in years (or days, or whatever you want).
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